...in that spirit...
*ahem*
(Kingdom Plantae)
I would never make a bass out of vegetables. Veggies....yuck!
I'm on it!!!

I copied that classification chain directly from "Woods of the World", and I had to take them at their printed word since I don't study much above the family level. I did a bit of quick research and here's one link to definition of the vegetable kingdom. Walnut is listed along with other nuts and berry producing "trees". What has your research turned up? I know the botanists fight tooth and nail over classifications time to time.
I think the high price for an ebony neck is downfall. Lots must be cut away and discarded to get a proper blank. The falldown is less valuable and the charge must be paid by someone me thinks. Probably the rarity of a quality board of ebony influences the price also.
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Class III. Words Relating to Matter
Section III. Organic Matter
1. Vitality
2. Special Vitality
367. Vegetable.
NOUN: VEGETABLE, vegetable kingdom; flora.
organism, plant, tree, shrub, bush, creeper, vine; herb, seedling, plantlet, exotic, annual, perennial, biennial, triennial; legume, pulse, vetch, greens; asparagus (vegetables) [See Food].
FOLIAGE, leafage, verdure, foliation, frondescence [rare]; prefoliation, vernation; branch, bough, ramage, stem, tigella or tigelle or tigellum or tigellus; leaf, spray, leaflet, frond, foliole, bract, bractlet, bracteole, cotyledon, pad [U. S.], flag, petal, needle, sepal; spray [See Part]; petiole, petiolule, bine; shoot, tendril.
FLOWER, blossom, bud, burgeon, blow, blowth [rare]; floweret, floret, floscule, flowering plant; inflorescence, flowerage.
TREE, sapling, seedling, stand, pollard, dryad [fig.]; oak, elm, beech, birch, timber tree, pine, palm, spruce, fir, hemlock, yew, larch, cedar, savin or savine, juniper, chestnut, maple, alder, ash, myrtle, magnolia, walnut, olive, poplar, willow, linden, lime; apple (fruit trees) [See Food]; arboretum [See Agriculture].
banyan, teak, acacia, deodar, pipal or pipal tree; fig tree, eucalyptus, gum tree.
WOODLANDS, virgin forest, forest primeval, forest, wood, timberland,